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Sentinel Plot Program in Soybeans

Posted: July 31, 2012

Good news - reports from the past week indicate that insect and disease populations remain low.

Reports from the past week indicate that insect and disease populations remain low.  Pests being reported include Japanese beetles, green cloverworm, grasshoppers and a few reports of spider mites.  Just one plot report any disease: Phytophthora root & stem rot in Lebanon County. Pests that were found during scouting are listed with their severity, which is rated on a 1-10 scale with 10 being the highest.  Make sure you check your fields to determine your local populations, but these reports will give you a sense of what pests are active in fields.

30 July 2012 – Tioga County

Field 1
Growth stage: R3

  • Bean leaf beetles active – Severity: 1
  • Japanese beetles active – Severity: 3
  • No diseases found

Field 2
Growth stage: R3

  • Bean leaf beetles active – Severity: 1
  • Japanese beetles active – Severity: 3
  • No diseases found

Field 3
Growth stage: R2

  • Japanese beetles active – Severity: 3
  • No diseases found

Dauphin County – 27 July 2012

Growth stage: R3.5

  • Potato leafhopper active – Severity: 5
  • Two-spotted spider mites active – Severity: 3
  • Japanese beetles active – Severity: 1
  • Soybean aphid present– Severity: 1
  • Grasshoppers active – Severity: 3
  • Lady beetles, honey bees and bumble bees present

Franklin County – 26 July 2012

Growth stage: R4

  • Brown Marmorated Stinkbug present – Severity: 1
  • Green cloverworm active – Severity: 1
  • Grasshoppers active – Severity: 1
  • Downy mildew – Severity: 1 present, probably not a 1 in severity yet
  • Septoria – Severity: 1

Lebanon County – 25 July 2012

Field 1
Growth stage: R4

  • Silver-spotted skipper caterpillars – Severity: 3
  • Potato leafhopper active – Severity: 2
  • Two-spotted spider mites – Severity: 3
  • Green cloverworm active – Severity: 2
  • Japanese beetles active – Severity: 2
  • Soybean aphid present – Severity: 2
  • Grasshoppers active – Severity: 3
  • Lady beetles and minute pirate bugs active
  • No diseases found

Field 2
Growth stage: R3

  • Silver-spotted skipper caterpillars – Severity: 1
  • Potato leafhopper active – Severity: 2
  • Two-spotted spider mites – Severity: 1
  • Green cloverworm active – Severity: 1
  • Grasshoppers active – Severity: 2
  • Velvetbean caterpillar – Severity: 2
  • Bumble bees, carpenter bees active
  • Phytophthora root & stem rot – Severity: 5

Berks County – 28 July 2012

Combined report from 2 fields
Growth stage: R2 in one field, R5 in the other

  • Brown marmorated stink bugs becoming active and are just present on the field edges
  • Bean leaf beetle present – Severity: 1
  • Potato leafhopper active – Severity: 2
  • Green cloverworm active – Severity: 1
  • Japanese beetles active – Severity: 1
  • Grasshoppers active – Severity: 2
  • Lady beetles, damsel bugs and spiders active

Crawford County - July 27, 2012

Growth stage: R3-4
•    No insects or diseases found

York County-July 27, 2012

Growth Stage: R3

  • Bean Leaf Beetle-Severity 1
  • Downey Mildew-Severity 1


The Pennsylvania Soybean Board is funding this Sentinel Plot Program, which is being managed by Penn State Extension and the Dept. of Entomology.  In this effort, Penn State Extension Educators are regularly scouting fifteen ‘typical’ soybean fields across the state, reporting significant populations of plant pathogens and insect pests.  For all the reports thus far, see Penn State’s Field Crop Entomology website (http://ento.psu.edu/extension/field-crops-new). 

Contact Information

John Tooker
  • Extension Specialist
Phone: 814-865-7082